diff --git a/thunderbird.spec b/thunderbird.spec
index e8f4370..ced9094 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -222,7 +222,7 @@ for langpack in `ls thunderbird-langpacks/*.xpi`; do
 done
 %{__rm} -rf thunderbird-langpacks
 %endif # build_langpacks
-cd -
+cd %{_builddir}/%{?buildsubdir}/%{tarballdir}
 
 # Copy over the LICENSE
 cd mozilla